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V120. Member operator[] of object 'foo' is declared with 32-bit type argument, but is called with memsize type argument.
This rule belongs to the "Diagnosis of 64-bit errors" group. The rules in this group are no longer developed and may be disabled in the future. If you use these rules, please contact our support team—we will help you find a replacement or suggest an alternative solution.
The analyzer detected a potential error of working with classes that contain operator[].
Classes with an overloaded operator[] are usually a kind of an array where the index of the item being called is operator[] argument. If operator[] has a 32-bit type formal argument but memsize-type is used as an actual argument, it might indicate an error. Let us consider an example leading to the warning V120:
class MyArray {
int m_arr[10];
public:
int &operator;[](unsigned i) { return m_arr[i]; }
} Object;
size_t k = 1;
Object[k] = 44; //V120This example does not contain an error but might indicate an architecture shortcoming. You should either work with MyArray using 32-bit indexes or modify operator[] so that it takes an argument of size_t type. The latter is preferable because memsize-types not only serve to make a program safer but sometimes allow the compiler to build a more efficient code.
The related diagnostic warnings are V108 and V302.
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